How much does a 3.00 to 4.99ct D SI2 lab grown radiant diamond cost?

As of October 2026, 3.00 to 4.99ct D SI2 lab grown radiant diamonds typically cost £339 GBP to £710 GBP, with a median price of £533 GBP. There are currently 2 diamonds matching this specification available across retailers.

Where can I find the best price on a D SI2 radiant diamond?

About 41% of these diamonds are available at multiple retailers, with an average price spread of 110%. A comparison tool like Carat Hunter lets you see all the prices side by side.

3.00 to 4.99ct D SI2 Lab Grown Radiant

Quick answer

As of October 2026, there are 2 lab grown radiant diamonds with D colour and SI2 clarity in the 3.00 to 4.99ct range available across retailers worldwide. Prices typically run £339 GBP to £710 GBP, with a median of £533 GBP. At least 21 retailers stock this exact specification, and 41% of the stones appear at more than one of them, with an average price spread of 110%. Half of all listings fall between £119 GBP and £308 GBP per carat. The same specification in natural form lists at a median of about £8,976 GBP per carat. Over the last 30 days the median price moved +20.6% and the number of listings moved +13.8%.

Three of the best scored stones at this specification right now:

Caratlytics Diamond Price Index, September 2026: natural diamonds at 2,335 USD per carat and lab-grown at 443 USD per carat, a natural to lab ratio of 5.3 to 1. Radiant lab grown stones in the index: 474 USD per carat, -2.1% month on month. See the full index release

Figures come from current listings across more than 100 retailers and refresh daily. The index is a monthly release.

Last updated: October 2026

Available

Lowest Price

£321 GBP

Highest Price

£3,274 GBP

Average Price

£528 GBP

Market Intelligence

Retailers Selling

Cross Retailer %

41.2%

Price Spread

110.1%

30-Day Price Trend

+20.6%

30-Day Supply Change

+13.8%

Volatility (30d)

0.09

Price Range

Price per carat distribution across retailers

$228/ct

10th Percentile

$134

Median

$228

90th Percentile

$598

Score Distribution

6 diamonds scored across 4 quality tiers

Excellent

1 (16.7%)

Very Good

1 (16.7%)

Good

1 (16.7%)

Average

3 (50.0%)

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Related Specifications

D IF D VVS1 D VVS2 D VS1 D VS2 D SI1 E IF E VVS1 E VVS2 E VS1 E VS2 E SI1 F IF F VVS1 F VVS2 F VS1 F VS2 F SI1 G IF G VVS1 G VVS2 G VS1 G VS2 G SI1 H IF H VVS1 H VVS2 H VS1 H VS2 H SI1 I IF I VVS1 I VVS2 I VS1 I VS2 I SI1